Boron-based solid propellants have attracted considerable attention due to boron’s exceptional volumetric and gravimetric calorific values, which are critical for high-energy propulsion systems.

As HVACR technicians, assessing whether the furnace we’re servicing is working efficiently is critical to understanding the overall health of the HVAC system — and to the success of our service call.

Firefighters tend to focus on visible fire (like a moth to a candle). Smoke is toxic and makes it hard to see, but does not present much of a threat to a firefighter wearing protective clothing and ...